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TCS3103, TCS3104
LIGHT-TO-VOLTAGE COLOR SENSOR
TAOS108B ? JULY 2010
Detailed Description
The TCS3103 and TCS3104 devices output a voltage that is linearly proportional to light intensity in the spectral
range of interest on each of the three sensor channels. Figure 2 shows how each sensor responds to light of
various wavelengths. The peak response of each of the three channels roughly corresponds to blue, green, and
red portions of the visible light spectrum. Thus, when light impinges upon the three elements, each element
gives an output that corresponds to the blue, green, and red components of the light. By measuring the
amplitude and ratios of the three channels, information about the color of the light can be obtained.
Each channel responds linearly to light intensity from a range of near zero light to a maximum value that is
determined by the gain and the supply voltage of the device. The output of the device can swing from near
ground level to near the supply voltage of the device. The dark voltage, or output of the device with no light input,
is determined by internal amplifier offsets and is factory-trimmed to be a minimum value. If very accurate,
low-level light measurement is required, the dark voltage value for each channel can be measured and
subtracted from subsequent light readings to obtain a more accurate light measurement.
The Multifunction Pin (MFP) on each device can be used for selecting gain mode (Table 1).
Table 1. Device Programming Option
Device
TCS3103
TCS3104
Terminal Functions
TERMINAL
Mode
GSM (Gain Select Mode)
GSM (Gain Select Mode)
Details
2 × (MFP = 0) or 4 × (MFP = 1)
4 × (MFP = 0) or 1 × (MFP = 1)
NAME
GND
MFP
V DD
V OB
V OG
V OR
NO.
2
3
1
4
5
6
TYPE
Power
I
Power
O
O
O
DESCRIPTION
Power supply ground. All voltages are referenced to GND.
Multi-function logic input.
Supply voltage.
Blue channel voltage output.
Green channel voltage output.
Red channel voltage output.
Available Options
DEVICE
TCS3103
TCS3104
Copyright E 2010, TAOS Inc.
Gain
2 × , 4 ×
4 × , 1 ×
PACKAGE ? LEADS
Dual Flat No-Lead ? 6
Dual Flat No-Lead ? 6
r
PACKAGE DESIGNATOR
FN
FN
ORDERING NUMBER
TCS3103FN
TCS3104FN
The LUMENOLOGY r Company
r
2
www.taosinc.com
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